There are many amazing brain corals on the left rocky side of the Turtle beach

Prevent snorkel mask fogging. If all else fails and you are out on the water with a foggy mask, remove it, spit in it, shake the mask around to coat the glass (don't rub it with your fingers), dump it out, and put it back on, this will generally fix the problem. If you don't have a lot of spit, dilute it with a small amount of salt water to coat the glass.